Hmmm...
Max load for Power Pistol with a 115 gr FMJ is 6.7
Less: 10% for a starting load = 6.03
we'll do 6-7 rounds of each
6.1
6.3
6.5
6.7
Here's what a friend had to say about Alliant Power Pistol and Zero bullets:
"Nice choice on Power Pistol. This is one of the most forgiving powders when it comes to high pressure cartridge reloading (9 mm, .40, 357 Sig, 10 mm), and I can easily get NATO-spec 9 mm loads, using standard pressure (1200 fps, 124 grainer, with just 6.4 grains).
The only two disadvantages to it, are that it produces a bright white flash, and that it makes more noise than other powders do. I had some 10 mm loads that were launching out 180 grainers at 1200 fps, and people swore that my Glock 20 made more noise than the next guy's .41 magnum. As the shooter, though, that never bothered me, since I have good hearing protection.
It meters exceptionally consistently, and it's a finely cut flake, so you get consistent metering each time.
It burns very cleanly in the higher pressure cartridges. I generally don't use it in the lower pressure cartridges (.38 Special, .45 ACP), unless I'm loading for more velocity, since in those cartridges, it may leave a bit more unburnt powder. Still performs very consistently, though.
On the burn speed scale, it's a bit slower than Unique, and a bit faster than the Blue Dot / AA #7 range.
Zero bullets are excellent. Once I get back into IDPA, I'll probably hop aboard the bullet train as well."